What part of speech is sore?

"Sore" can be two parts of speech, depending on how it's used:

* Adjective: Describing a physical pain or discomfort. For example, "My muscles are sore after the workout."

* Adverb: Meaning "very much" or "extremely." For example, "I am sore tempted to eat that cake."

To determine which part of speech "sore" is, you need to look at its function in the sentence.